The concept of the game will be a concept of the book "Roadside Picnic", the game will take place in several countries, but rather in their cities that have become "Visiting Zones". "Visitation Zones" will be more than in the book, as well as area they will not affect one city, but several at once.
The game will not use the plot of the book "Roadside Picnic", and only use concept of the plot!